Shrink film is a protective wrapping for articles of merchandise; it consists of clear plastic film that is wound about the product and then shrunk by heat to form a sealed, tight-fitting package. This type of packaging is also called shrink package.
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Shrink wrapping is widely used across the spectrum of industries and is finding its way into new segments daily. The retail appeal and security offered insures growth for the future.
Shrink Wrapping Printed Materials -This is still the largest of all market segments. Once dominated by PVC films, the introduction of the low shrink force polyolefin has dramatically eroded the PVC domination of this market. Businesses involved in this segment range from small job shop printers up to large business form producers. Gone are the days of contracting these jobs out, as most now perform the packaging within their own facilities.
Shrink Wrap Film For Toys, Games, and Sporting Goods - Shrink is used here to assure product integrity and offer the consumer visual appeal. Plastic models, puzzles, and games all benefit from the security of shrink film.
Shrink Packaging For Hardware and Houseware - A broad category with a tremendous variety of product being overwrapped. From tools to plastic bowls, shrink fulfills the need once served by corrugated and blister packaging.
Shrink Wrap For Packaged Foods - Major applications include frozen pizza, ice cream, and frozen foods. The fastest growing trend is the process of multi-packing products for sale at wholesale type stores. The use of shrink offers the benefits of enhanced visual appeal, tamper evidence and prolonged shelf life, through the prevention of freezer burn.
Shrink Wrapped Stationary, Cards and Gift Wrap - PVC films are still widely used to protect these easily damaged products and improve appearance. Today&#;s soft shrink films afford the opportunity to introduce polyolefin films into this market.
Shrink Wrap Packaging For Pharmaceuticals - Spurred by the need for tamper-evidence, this market has grown in recent years. Lower cost alternatives, i.e. PVC shrink bands, control most of the individual product need, however, shrink offers the ability reduce costs through multipacking with film vs. other packaging alternatives.
Shrink Wrap For Video Tapes and CD's - These products all benefit from some sort of film overwrap. Video is predominately shrink wrapped where CD is usually done with a non-shrink process such as tuck and fold. More and more CD producers have turned to shrink as they are updating equipment.
The end-user of shrink film purchases the product by means of roll cost. A roll of 60 gauge film costs $XX.xx. Many times a person would like to know how much the amount of film on each package is costing them.
For example; A small manufacturer is overwrapping his product on a manual L-bar sealer. His current supplier has recommended he use 8" centerfold film in a 60 ga. material.
With the new situation, the total amount of scrap generated equals 8% of film purchased. By simply turning the product this shrink wrap customer has saved 4% per roll. In addition to the savings this shrink wrap customer will benefit a higher package yield from a single roll ( packages / per roll) and increased production speed. (The new package is 35% shorter than the old method allowing faster through-put.)
Shrink Film: A film that is sealed around a product and then heated to shrink to the product.
Stretch Film: A film that is stretched and wrapped around a load. The stretch film then creates tension around the load and keeps it from shifting while being transported.
All of our shrink wrap products are coextruded films. Polymer resins are loaded into hoppers at the rear of extrusion equipment. These resins are then pushed through a heated barrel by a screw. When forced down the barrel the resins are melted and compacted then finally forced through a circular die.
We use multiple extruders to feed into one die. The resin from each of these extruders is then layered over one another as the melt exits the die. This results in a multilayered product.
The extruded structure in the form of a tube is then turned upward, then back downward and filled with air. This process converts the tube into a bubble. This bubble is then stretched on both axis, horizontally by the air flow and vertically by means of a set of pinch rollers drawing the tube down. The act of stretching the film tube on both axis is known as bi-axial orientation. A bi-axial orientation gives the film many of the required strengths of a shrink film.
The pinch rollers collapse the bubble into sheet form where it is then rolled onto a core. This roll of material is called a mill log.
The mill logs are then converted into the finished product. Conversion entails slitting of the film to width and folding in the case of centerfold film. Perforation is completed during this conversion process.
Choosing the right shrink wrap equipment for your packaging needs is a very important step in designing an effective and efficient packaging operation. There are many different types of shrink wrap systems designed for different applications, performance levels, and budget. When shopping for a shrink wrap system, take into consideration what your current needs are now and what they may be in the future.
There are many types of shrink wrap film that are suited for specific types of applications. Shrink wrap films should be considered when shopping for a shrink wrapper system to ensure no shrink film issues arise later.
Shrink wrapping systems vary widely in the packaging speed. Know your wrapping output needs and compare systems. For example some shrink wrappers pack several products an hour while others pack 35 products per minute and more. Once volume levels are determined, degree of automation can be considered as well, choices are: manual shrink wrappers, semi-automatic shrink wrappers or fully automatic shrink wrapper systems.
Is the shrink wrapper to be integrated into an automated packaging production line? If so, not all shrink wrap systems are suited for integrated packaging operations and add on systems like conveyors will need to be carefully selected for flexibility and suitability for the packaging processes involved.
Like most things, shrink wrap systems, machines and applicators come in different sizes. If your packaging units are large, likely your shrink wrap system will also.
Shrink wrap machines come in different sizes and mobility. For example if you have small space, small items to package and need the system to move as your workspace demands, you may want to consider a compact straight l-bar sealer as your shrink wrap system of choice.
Shrink wrap sizing also known as package sizing is the act of determining the appropriate size film for overwrapping of a specific package with shrink film. Many factors must be considered when sizing the film requirements. The actual product dimensions, the orientation of the package as it will introduce into the film and the type of equipment to be used are all required information. Failure to obtain this information or incorrect specifications may result in inappropriate film size being calculated.
Each package has three dimensions which must be known. These measurements should be made with the orientation (positioning) of the package as it enters the film identified.
Another consideration when recommending film size is production speed. In many cases, the formula to calculate required film size turns out not to be a whole number. Although 1/2" increments are available, most users opt for a standard inch size, usually rounding down in an attempt to save money. Many times this practice actually costs more than the cost had they rounded up and increased the film size. By trying to use the narrowest film size possible, users may actually make an operator's job more difficult, reducing production speed and increasing the overall package cost.
Once package orientation and dimensions are established, the next consideration is the type of equipment upon which the package is to be wrapped. Specific types of equipment dictate the use of either center folded or single wound film. Furthermore, some types of machinery demand the use of wider film sizes than others due to the mechanics of their operation.
When using the film sizing formulas to calculate film sizes, be sure to use the formula for the type of equipment it is to be used on.
IPS Packaging is a leading provider of packaging supplies, packaging equipment and packaging solutions. If you would like to know more about IPS Packaging, call 800.277. or contact our Sales team.
Buying shrink film for the first time can be a confusing experience, especially if you're unfamiliar with the different types and their specific applications. Whether you are looking to package products, seal items for protection, or enhance product presentation, it&#;s essential to choose the right shrink film for your needs. To help guide you through the process, here are some critical questions to ask when purchasing shrink film for the first time.
The first step in buying shrink film is understanding the different types available. Shrink film comes in various formulations and types, each suited to specific uses:
Polyolefin (POF): This is the most common and versatile shrink film, known for its clarity, strength, and flexibility. It&#;s ideal for retail packaging, food packaging, and shrink-wrapping products.
Polyethylene (PE): Known for its thickness and durability, PE shrink film is typically used for heavier products, such as large bundles or heavy equipment, where more strength is required.
PVC (Polyvinyl Chloride): PVC shrink film is often used for shrink wrapping products like CDs, DVDs, and electronics. It is rigid and less flexible than POF or PE but provides an excellent finish.
Consider your product size, weight, and type when deciding which shrink film to purchase. For example, if you need flexibility and a clear finish for retail-ready products, polyolefin shrink film is likely the best option.
Shrink Film
The thickness and size of the shrink film are critical factors in determining how well it will perform. Shrink film comes in various gauges (thicknesses), and the choice depends on the size and weight of the item being wrapped:
Thin Film (50-75 gauge): Ideal for small to medium-sized products, especially those that do not require heavy protection.
Medium Film (75-100 gauge): Suitable for larger items or those that require a balance between protection and flexibility.
Thick Film (100+ gauge): Typically used for heavy-duty packaging, such as bundling heavy items or sealing bulk products.
Additionally, shrink film comes in different widths. Be sure to select a size that fits the dimensions of your products to avoid unnecessary waste and to ensure a snug, professional-looking wrap.
The shrink ratio refers to how much the film shrinks when heat is applied. A typical shrink film will shrink in both directions (width and length), and the ratio can range from 30% to 75%, depending on the type of film. Understanding the shrink ratio is vital for getting a tight, secure fit around your products.
High Shrink Ratio (60-75%): Best for tightly wrapping small, irregularly shaped items. This ensures a snug fit and helps prevent product movement during shipping and handling.
Link to YH Package
Medium Shrink Ratio (30-50%): Suitable for larger products or items that need less compression.
If you're wrapping multiple products together, a higher shrink ratio may be beneficial as it ensures the film tightly seals and secures them.
The intended application of the shrink film should be a primary consideration in your decision. Some films are better suited for machine applications, while others are designed for manual use:
Machine Shrink Film: This type of shrink film is designed for automatic or semi-automatic shrink-wrapping machines. It&#;s ideal for businesses that require high-volume packaging.
Hand Stretch Shrink Film: This is a thinner and more flexible option designed for manual wrapping. It's often used for small operations or for wrapping a few products at a time.
Consider how the film will be applied, the machinery you have available, and your production volume when deciding on the type of film.
The seal strength of shrink film refers to how well the edges of the film seal together once heat is applied. A weak seal can lead to the film splitting or coming apart, compromising the integrity of the package. Make sure to ask the supplier about the seal strength, particularly if you plan to wrap heavy or sharp-edged products. Films with a higher seal strength are ideal for products that need extra durability during shipping and storage.
If you&#;re using shrink film for packaging food products, it's essential to ensure that the film is food-safe. Look for films that are specifically labeled as non-toxic and FDA-approved for food contact. Films that are food-safe are free from harmful chemicals and will not contaminate the contents they protect.
Additionally, make sure that the film is breathable if you're wrapping perishable items. Some shrink films are designed to allow for air circulation, which is crucial for maintaining the freshness of food items.
It's important to consider how the shrink film will perform under varying conditions, such as temperature, humidity, and exposure to UV light. If your products will be exposed to extreme conditions during shipping or storage, choose a shrink film that offers the necessary protection:
Temperature Resistance: Some shrink films are better suited to withstand extreme temperatures, both hot and cold, without losing their integrity.
UV Protection: UV-resistant shrink films are ideal for products that will be exposed to sunlight, preventing the film from degrading or discoloring.
Moisture Resistance: If your products are sensitive to moisture, select shrink film that provides a high level of water resistance to protect your goods.
By understanding the environmental conditions your products will face, you can choose a shrink film that will offer the best protection.
Cost is a crucial factor when buying shrink film. Prices can vary significantly depending on the type, thickness, and quantity of film. When shopping for shrink film, consider the following:
Bulk Purchasing: If you plan on using a large quantity of shrink film, purchasing in bulk may help you save money in the long run. Many suppliers offer discounts for larger orders.
Supplier Reputation: Look for reliable and experienced suppliers who can provide high-quality shrink film. Check reviews and ask for recommendations to ensure you're buying from a trusted source.
Shipping and Handling: Don&#;t forget to factor in shipping costs, especially if you're ordering large quantities of shrink film. Be sure to compare total costs from different suppliers.
Getting the best deal involves not just finding the lowest price, but ensuring you are purchasing high-quality film that meets your needs.
Q1: Can I use shrink film without a shrink tunnel or heat gun?
A1: While it&#;s possible to use a heat gun or oven for small batches, using a shrink tunnel or automatic machine is recommended for faster, more consistent results, especially for larger volumes.
Q2: Can I print on shrink film?
A2: Yes, many shrink films are printable. If branding or customization is important for your products, check with the supplier to ensure the film is compatible with your printing methods.
Q3: What&#;s the best shrink film for retail packaging?
A3: Polyolefin (POF) is typically the best choice for retail packaging, as it offers a clear, professional finish and is versatile enough for a variety of products.
Q4: Can I use shrink film for wrapping fragile items?
A4: Yes, shrink film can be used to wrap fragile items. It provides a tight fit and can help protect items from dust, dirt, and minor impacts during transportation.
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